N.M. Stat. § 31-26-7
Designation or appointment of victim's representative.
A. A victim may designate a victim's representative to exercise all rights provided to
the victim pursuant to the provisions of the Victims of Crime Act. A victim may revoke
his designation of a victim's representative at any time.
B. When a victim is deceased, incompetent or unable to designate a victim's
representative, the court may appoint a victim's representative for the victim. If a victim
regains his competency, he may revoke the court's appointment of a victim's
representative.
C. When the victim is a minor, the victim's parent or grandparent may exercise the
victim's rights; provided, that when the person accused of committing the criminal
offense against the victim is the parent or grandparent of the victim, the court may
appoint a victim's representative for the victim.